US7810868B2 - Motor vehicle frame structure and crashbox therefor - Google Patents

Motor vehicle frame structure and crashbox therefor Download PDF

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Publication number
US7810868B2
US7810868B2 US12/061,382 US6138208A US7810868B2 US 7810868 B2 US7810868 B2 US 7810868B2 US 6138208 A US6138208 A US 6138208A US 7810868 B2 US7810868 B2 US 7810868B2
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United States
Prior art keywords
sleeve
motor vehicle
longitudinal beam
box assembly
crash box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US12/061,382
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English (en)
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US20080238142A1 (en
Inventor
Bardo BRAUNBECK
Theobald HOCK
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOCK, THEOBALD, BRAUNBECK, BARDO
Publication of US20080238142A1 publication Critical patent/US20080238142A1/en
Assigned to UNITED STATES DEPARTMENT OF THE TREASURY reassignment UNITED STATES DEPARTMENT OF THE TREASURY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES, CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES reassignment CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: UNITED STATES DEPARTMENT OF THE TREASURY
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES, CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Assigned to UNITED STATES DEPARTMENT OF THE TREASURY reassignment UNITED STATES DEPARTMENT OF THE TREASURY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to UAW RETIREE MEDICAL BENEFITS TRUST reassignment UAW RETIREE MEDICAL BENEFITS TRUST SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Priority to US12/769,156 priority Critical patent/US7938476B2/en
Publication of US7810868B2 publication Critical patent/US7810868B2/en
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Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: UNITED STATES DEPARTMENT OF THE TREASURY
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS, INC. reassignment GM GLOBAL TECHNOLOGY OPERATIONS, INC. RELEASE OF SECURITY INTEREST Assignors: UAW RETIREE MEDICAL BENEFITS TRUST
Assigned to WILMINGTON TRUST COMPANY reassignment WILMINGTON TRUST COMPANY SECURITY AGREEMENT Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Assigned to GM Global Technology Operations LLC reassignment GM Global Technology Operations LLC CHANGE OF NAME Assignors: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Priority to US13/088,080 priority patent/US8287031B2/en
Assigned to GM Global Technology Operations LLC reassignment GM Global Technology Operations LLC RELEASE OF SECURITY INTEREST Assignors: WILMINGTON TRUST COMPANY
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type

Definitions

  • the present invention relates to a crashbox and a motor vehicle frame structure utilizing such a crashbox.
  • Crashboxes are conventionally built into a motor vehicle frame structure between the longitudinal beams thereof and a bumper carrier in order to absorb impact energy by the deformation thereof in the event of a none too severe collision and thereby prevent the possibility of one of the longitudinal beams being deformed. Deformation of a longitudinal beam is only reparable, if at all, at high cost.
  • Such a crashbox it is conventional for such a crashbox to have a boxlike structure with walls that extend as an extension of the longitudinal beam and are structured such as to be compressed in bellows-like manner in the event of an impact, and also flanges which are aligned transversely relative to these walls and serve for the attachment of the crashbox to a bumper carrier and an end face of the longitudinal beam.
  • the construction of the frame structure could be simplified if the crashbox could be fixed to the longitudinal beam, not with the help of mutually opposite flanges, but rather, by sticking a spigot member of the crashbox into a cavity in the longitudinal beam which, conventionally, is usually in the form of a hollow square section.
  • the longitudinal beam which, conventionally, is usually in the form of a hollow square section.
  • the cross section thereof in order to enable the spigot member to be inserted, the cross section thereof must be somewhat smaller than that of the cavity accommodating it. When this is the case however, the spigot member cannot touch the opposite walls of the cavity at the same time and introduce force into them.
  • At least one object is achieved in that, in the case of a crashbox for connecting a bumper carrier and a longitudinal beam in a frame structure of a motor vehicle which comprises a section that is compressible in a longitudinal direction and a first fixing element for attachment to the longitudinal beam and a second fixing element for attachment to the bumper carrier at opposite ends of this section, wherein the first fixing element is in the form of a spigot member that can be inserted into a cavity of the longitudinal beam, a support strut extends between two rigid side flanks of the spigot member through an internal cavity of the spigot member.
  • the support strut limits the compliance of the spigot member in the face of a force that is effective from the compressible section and drives the flanks of the spigot member towards each other so that a closing movement of the flanks such as would exceed the bounds of the resilient ductility of the longitudinal beam can be prevented.
  • the support strut In order to enable the spigot member to be introduced into the cavity of the longitudinal beam with a certain amount of play on the one hand but nevertheless enable the flanks thereof to come into close contact with the walls of the longitudinal beam on the other, provision can be made according to a first embodiment for the support strut to comprise at least one section that is connected to one of the flanks and unconnected to the respective other flank. In consequence, the support strut does not hinder the spreading of the flanks of the spigot member when attaching it to the longitudinal beam. A deformation of the spigot member by a movement of the flanks towards one another is however limited by the support strut.
  • the two flanks are indeed connected to one another by the support strut, but the support strut incorporates a predetermined break point in order to enable the flanks to spread apart when assembling the crashbox.
  • the support strut is preferably a web member extending in the direction in which the spigot member is inserted.
  • the spigot member preferably comprises an outer skin that is expandable in a direction perpendicular to the side flanks.
  • the outer skin has a corrugated shape in a section connecting the two side flanks.
  • the outer skin is expediently joined to the compressible section in material-uniting, preferably, one-piece manner.
  • the side flanks each comprise one of two mutually opposite webs of an H-shaped profile, and the support strut is formed by a centre web member of this profile.
  • An exemplary embodiment also includes a frame structure for a motor vehicle comprising at least one longitudinal beam and a bumper carrier which is attached to the longitudinal beam by a crashbox of the type described above. If the side flanks of the spigot member are attached to opposite walls of a cavity of the longitudinal beam and thereby spread apart, a gap will exist between a section of the support strut connected to one of the flanks and the respectively oppositely located flank or a section of the support strut connected to this flank. In the case where the spigot member of the crashbox originally exhibited a predetermined break point, the gap is formed at the location of this predetermined break point.
  • the attachment of the spigot member to the longitudinal beam is preferably effected with the aid of bolts which pass through the opposite walls of the longitudinal beam and the flanks of the spigot member.
  • FIG. 1 shows a perspective view of a part of the frame structure of a motor vehicle in accordance with the present invention
  • FIG. 2 shows an enlarged sectional view of the frame structure shown in FIG. 1 ;
  • FIG. 3 shows a perspective exploded view of an end of the crashbox in accordance with the present invention
  • FIG. 4 shows a cross section through the spigot member of the crashbox when inserted into a longitudinal beam, prior to the attachment of the crashbox to the longitudinal beam;
  • FIG. 5 shows a cross section analogous to FIG. 4 in the attached state
  • FIG. 6 shows a longitudinal section through the spigot member and the tip of the longitudinal beam accommodating the spigot member in the attached state
  • FIG. 7 shows a longitudinal section analogous to FIG. 6 , which represents the state after a collision
  • FIG. 8 shows a sectional view in accordance with a modified embodiment of the invention, analogous to FIG. 4 ;
  • FIG. 9 shows a further sectional view in accordance with a modified embodiment of the invention, analogous to FIG. 4 .
  • FIG. 1 shows a perspective view of a part of the frame structure 1 of a motor vehicle chassis with longitudinal beams 2 and a bumper cross beam 3 .
  • Crashboxes 4 are arranged in the form of an extension of the longitudinal beams 2 between the bumper cross beam 3 and the longitudinal beams 2 .
  • the bumper cross beam 3 can be the carrier of a front bumper or a rear one.
  • the longitudinal beam 2 is substantially tubular with a rectangular cross section and has open longitudinal ends into which a respective spigot member of the crashbox 4 is inserted, said spigot member being hidden in FIGS. 1 and 2 .
  • the spigot member is anchored to the longitudinal beam 2 with the aid of bolts 6 which extend through borings in the mutually opposite side walls 7 of the beam.
  • FIG. 3 shows a perspective view of a part of the crashbox 4 including the spigot member that is to be introduced into the cavity of the longitudinal beam 2 and is designated by 5 herein.
  • the crashbox 4 comprises a compressible main section 8 which is only partly illustrated in FIG. 3 and is substantially in the form of a tubular member having a typical length of about 20 to 25 cm and a rectangular cross section. At an end thereof which is not illustrated in FIG. 3 , the main section 8 is closed by a plate-like flange which serves for attachment to a complementary flange of the bumper cross beam 3 . At the end thereof shown in FIG.
  • the main section 8 is extended in one-piece manner by a sleeve 9 , the height and width dimensions of which are somewhat smaller than those of the main section.
  • a peripheral shoulder 10 between the main section 8 and the sleeve 9 serves as a stop which limits the depth of penetration of the spigot member 5 into the longitudinal beam 2 .
  • the sleeve 9 has a substantially horizontal upper and lower wall in each of which a groove 11 extending in the longitudinal direction is formed.
  • Corresponding bolt holes 13 are formed in two lateral webs 15 of an H-profile piece 16 which is intended to be placed inside the sleeve 9 in contact with the side walls 14 thereof.
  • a predetermined break point 18 is formed in the central web member 17 of the profile piece.
  • the length of the profile piece 16 amounts, in like manner to that of the sleeve 9 , to approximately 50 mm; it consists of a solid, but brittle metal, preferably an aluminium alloy.
  • FIG. 4 shows a sectional view through the sleeve 9 and the profile piece 16 placed therein, these together forming the spigot member 5 , and also a view through the longitudinal beam 2 accommodating the spigot member 5 .
  • the spigot member 5 is accommodated in the longitudinal beam 2 with a certain degree of play in the height and width directions. There is a gap 19 of a few millimetres in width between the respective side walls 7 and 14 of the longitudinal beam 2 and the sleeve 9 .
  • the bolts 6 are pushed through the bolt holes 20 in the longitudinal beam 2 and the bolt holes 12 in the sleeve 9 and screwed into an internal thread in the bolt holes 13 in the profile piece 16 .
  • the tensile force of the bolts 6 that is consequently effective on the profile piece 16 eventually leads to rupture of the profile piece 16 at the predetermined break point 18 , and the sleeve 9 is widened at the level of the grooves 11 as can be seen in FIG. 5 .
  • FIG. 6 shows the installed spigot member 5 with its ruptured predetermined break point 18 , but this time in the form of a horizontal sectional view.
  • a corresponding sectional view after a collision and compression of the main section 8 of the crashbox 4 is shown in FIG. 7 .
  • the forces arising from the deformation of the main section 8 drive the side walls 14 of the sleeve 9 towards one another, but the side walls 14 can only move so far towards one another, namely, until the two fragments of the central web member 17 meet together.
  • FIG. 7 shows the forces arising from the deformation of the main section 8 drive the side walls 14 of the sleeve 9 towards one another, but the side walls 14 can only move so far towards one another, namely, until the two fragments of the central web member 17 meet together.
  • the predetermined break point 18 occupies only a small fraction of the total width of the central web member 17 and one might assume that, in the event of upsetting of the crashbox 4 , the two fragments of the central web member 17 would separate apart in the vertical direction and thus be able to slide above one another, this thereby substantially negating the supporting effect of the central web member 17 in the event of a collision.
  • experiments have shown that such a process of sliding above one another does not occur, but instead, the irregularly formed mutually facing edges of the fragments hook together and actually prevent such a separating movement.
  • FIGS. 8 to 9 show modified embodiments of the invention each analogous to the sectional view of FIG. 4 .
  • the H-profile piece 16 depicted in FIG. 4 is replaced by two T-section profiles 22 which are mutually arranged as a mirror-image, whereby the crossbar of the T corresponds to a respective one of the lateral webs 15 and the foot 21 of the T to a respective one of the fragments of the central web member 17 . That is to say, the essential difference between the embodiment of FIG. 8 and those of FIGS.
  • the predetermined break point 18 does of course ease the task of tightening the bolts 6 , but does not simplify the assembly process overall due to the larger number of parts that have to be handled.
  • the feet 21 must be of a somewhat greater material thickness than the web member 15 in order to prevent the two feet 21 from being pushed above one another in the event of a collision.
  • the spigot member 5 is reinforced by a T-shaped profile piece 23 and a plate-shaped profile piece 24 , whereby the foot 25 of the T-section profile 23 extends into the direct proximity of the plate-shaped profile piece 24 .
  • the foot 25 of the T-section profile 23 extends into the direct proximity of the plate-shaped profile piece 24 .
  • an increased material thickness may be necessary in order to ensure sufficient form stability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
  • Body Structure For Vehicles (AREA)
  • Connection Of Plates (AREA)
US12/061,382 2007-04-02 2008-04-02 Motor vehicle frame structure and crashbox therefor Expired - Fee Related US7810868B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/769,156 US7938476B2 (en) 2007-04-02 2010-04-28 Motor vehicle frame structure and crashbox therefor
US13/088,080 US8287031B2 (en) 2007-04-02 2011-04-15 Motor vehicle frame structure and crashbox therefor

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007015865A DE102007015865A1 (de) 2007-04-02 2007-04-02 Kraftfahrzeug-Rahmenstruktur und Crashbox dafür
DE102007015865 2007-04-02
DE102007015865.5 2007-04-02

Related Child Applications (1)

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US12/769,156 Division US7938476B2 (en) 2007-04-02 2010-04-28 Motor vehicle frame structure and crashbox therefor

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US20080238142A1 US20080238142A1 (en) 2008-10-02
US7810868B2 true US7810868B2 (en) 2010-10-12

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US12/769,156 Expired - Fee Related US7938476B2 (en) 2007-04-02 2010-04-28 Motor vehicle frame structure and crashbox therefor
US13/088,080 Expired - Fee Related US8287031B2 (en) 2007-04-02 2011-04-15 Motor vehicle frame structure and crashbox therefor

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US13/088,080 Expired - Fee Related US8287031B2 (en) 2007-04-02 2011-04-15 Motor vehicle frame structure and crashbox therefor

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DE (1) DE102007015865A1 (de)

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US20100230983A1 (en) * 2006-04-05 2010-09-16 Gm Global Technology Operations, Inc. Crashbox and damping arrangement with crashbox
US20120228890A1 (en) * 2006-04-25 2012-09-13 GM Global Technology Operations LLC Arrangement and method for attaching a bumper to side members of a vehicle
US20130057000A1 (en) * 2011-09-02 2013-03-07 GM Global Technology Operations LLC Motor vehicle with crashbox
US20130119682A1 (en) * 2011-11-11 2013-05-16 GM Global Technology Operations LLC Motor vehicle with crashbox
US11148624B2 (en) * 2019-02-22 2021-10-19 Benteler Automobiltechnik Gmbh Bumper arrangement for a motor vehicle
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US7896428B2 (en) * 2005-01-28 2011-03-01 Toyota Jidosha Kabushiki Kaisha Vehicle body structure
DE102005029738B4 (de) * 2005-06-24 2018-10-04 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Energieabsorberelement und dieses verwendende Kraftfahrzeugkarosserie
DE102009053764A1 (de) 2009-11-18 2011-05-26 Daimler Ag Fahrzeug mit einer Fahrzeugkarosserie
FR2971980A1 (fr) * 2011-02-28 2012-08-31 Peugeot Citroen Automobiles Sa Vehicule comportant un absorbeur de choc et absorbeur de choc correspondant
DE102011117933A1 (de) * 2011-11-08 2013-05-08 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Crashbox
DE102012024978A1 (de) 2012-12-20 2014-06-26 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Kraftfahrzeug-Rahmenstruktur und Crashbox dafür
US9079543B2 (en) 2013-01-31 2015-07-14 JJR Innovations, Inc. Apparatus and method for preserving spacing around a vehicle
FR3014386B1 (fr) 2013-12-06 2016-12-09 Constellium Singen Gmbh Structure d'absorption de chocs pour vehicule automobile
DE102013225343A1 (de) * 2013-12-10 2015-06-11 Voith Patent Gmbh Energieabsorber, Kupplung und Fahrzeug mit einem Energieabsorber sowie Verfahren zur Herstellung eines Energieabsorbers
US11819334B2 (en) 2014-03-27 2023-11-21 Smart Human Dynamics, Inc. Systems, devices, and methods for tracking abdominal orientation and activity for prevention of poor respiratory disease outcomes
CN106999100A (zh) 2014-03-27 2017-08-01 智能人动力公司 用于追踪腹部取向和活动的系统、装置和方法
DE102014108979B4 (de) * 2014-06-26 2019-10-17 Thyssenkrupp Steel Europe Ag Vorrichtung zur Absorption von Energie bei einem Fahrzeugaufprall
US10239559B2 (en) 2016-03-14 2019-03-26 Honda Motor Co., Ltd. Vehicle frames and methods of assembling the same
US10246036B2 (en) * 2017-06-30 2019-04-02 Ford Global Technologies, Llc Secondary bumper assembly
KR102586916B1 (ko) * 2018-07-16 2023-10-10 현대자동차주식회사 초경량 로어 멤버리스 프론트 엔드 모듈
EP3786000B1 (de) 2019-08-26 2025-12-24 Volvo Car Corporation Verbindungsvorrichtung zur verbindung eines fahrzeugaufpralldämpfungselements mit einer fahrzeugkarosseriekomponente

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Cited By (9)

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US8052184B2 (en) * 2006-04-05 2011-11-08 GM Global Technology Operations LLC Crashbox and damping arrangement with crashbox
US20120228890A1 (en) * 2006-04-25 2012-09-13 GM Global Technology Operations LLC Arrangement and method for attaching a bumper to side members of a vehicle
US8454064B2 (en) * 2006-04-25 2013-06-04 GM Global Technology Operations LLC Arrangement and method for attaching a bumper to side members of a vehicle
US20130057000A1 (en) * 2011-09-02 2013-03-07 GM Global Technology Operations LLC Motor vehicle with crashbox
US20130119682A1 (en) * 2011-11-11 2013-05-16 GM Global Technology Operations LLC Motor vehicle with crashbox
US9079552B2 (en) * 2011-11-11 2015-07-14 GM Global Technology Operations LLC Motor vehicle with crashbox
US11148624B2 (en) * 2019-02-22 2021-10-19 Benteler Automobiltechnik Gmbh Bumper arrangement for a motor vehicle
US11225212B2 (en) 2019-04-01 2022-01-18 Volvo Car Corporation One piece load distribution device

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US20080238142A1 (en) 2008-10-02
US8287031B2 (en) 2012-10-16
US7938476B2 (en) 2011-05-10
EP1977935B1 (de) 2013-04-24
EP1977935A2 (de) 2008-10-08
EP1977935A3 (de) 2009-06-03
US20100201140A1 (en) 2010-08-12
US20110193358A1 (en) 2011-08-11
DE102007015865A1 (de) 2008-10-16

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